//
//  Copyright (c)1998-2012,  Public Technology
//  All Rights Reserved.
//
//	Description:
//	$Id: Crc.cpp 11 2013-01-22 08:42:03Z  $
//


#ifdef  __linux__
#include <sys/types.h>
#include <unistd.h>
#endif
 
#include "Base/Crc.h"

namespace Public {
namespace Base {
unsigned short const crc16_table[256] =
{
    0x0000, 0xC0C1, 0xC181, 0x0140, 0xC301, 0x03C0, 0x0280, 0xC241,
    0xC601, 0x06C0, 0x0780, 0xC741, 0x0500, 0xC5C1, 0xC481, 0x0440,
    0xCC01, 0x0CC0, 0x0D80, 0xCD41, 0x0F00, 0xCFC1, 0xCE81, 0x0E40,
    0x0A00, 0xCAC1, 0xCB81, 0x0B40, 0xC901, 0x09C0, 0x0880, 0xC841,
    0xD801, 0x18C0, 0x1980, 0xD941, 0x1B00, 0xDBC1, 0xDA81, 0x1A40,
    0x1E00, 0xDEC1, 0xDF81, 0x1F40, 0xDD01, 0x1DC0, 0x1C80, 0xDC41,
    0x1400, 0xD4C1, 0xD581, 0x1540, 0xD701, 0x17C0, 0x1680, 0xD641,
    0xD201, 0x12C0, 0x1380, 0xD341, 0x1100, 0xD1C1, 0xD081, 0x1040,
    0xF001, 0x30C0, 0x3180, 0xF141, 0x3300, 0xF3C1, 0xF281, 0x3240,
    0x3600, 0xF6C1, 0xF781, 0x3740, 0xF501, 0x35C0, 0x3480, 0xF441,
    0x3C00, 0xFCC1, 0xFD81, 0x3D40, 0xFF01, 0x3FC0, 0x3E80, 0xFE41,
    0xFA01, 0x3AC0, 0x3B80, 0xFB41, 0x3900, 0xF9C1, 0xF881, 0x3840,
    0x2800, 0xE8C1, 0xE981, 0x2940, 0xEB01, 0x2BC0, 0x2A80, 0xEA41,
    0xEE01, 0x2EC0, 0x2F80, 0xEF41, 0x2D00, 0xEDC1, 0xEC81, 0x2C40,
    0xE401, 0x24C0, 0x2580, 0xE541, 0x2700, 0xE7C1, 0xE681, 0x2640,
    0x2200, 0xE2C1, 0xE381, 0x2340, 0xE101, 0x21C0, 0x2080, 0xE041,
    0xA001, 0x60C0, 0x6180, 0xA141, 0x6300, 0xA3C1, 0xA281, 0x6240,
    0x6600, 0xA6C1, 0xA781, 0x6740, 0xA501, 0x65C0, 0x6480, 0xA441,
    0x6C00, 0xACC1, 0xAD81, 0x6D40, 0xAF01, 0x6FC0, 0x6E80, 0xAE41,
    0xAA01, 0x6AC0, 0x6B80, 0xAB41, 0x6900, 0xA9C1, 0xA881, 0x6840,
    0x7800, 0xB8C1, 0xB981, 0x7940, 0xBB01, 0x7BC0, 0x7A80, 0xBA41,
    0xBE01, 0x7EC0, 0x7F80, 0xBF41, 0x7D00, 0xBDC1, 0xBC81, 0x7C40,
    0xB401, 0x74C0, 0x7580, 0xB541, 0x7700, 0xB7C1, 0xB681, 0x7640,
    0x7200, 0xB2C1, 0xB381, 0x7340, 0xB101, 0x71C0, 0x7080, 0xB041,
    0x5000, 0x90C1, 0x9181, 0x5140, 0x9301, 0x53C0, 0x5280, 0x9241,
    0x9601, 0x56C0, 0x5780, 0x9741, 0x5500, 0x95C1, 0x9481, 0x5440,
    0x9C01, 0x5CC0, 0x5D80, 0x9D41, 0x5F00, 0x9FC1, 0x9E81, 0x5E40,
    0x5A00, 0x9AC1, 0x9B81, 0x5B40, 0x9901, 0x59C0, 0x5880, 0x9841,
    0x8801, 0x48C0, 0x4980, 0x8941, 0x4B00, 0x8BC1, 0x8A81, 0x4A40,
    0x4E00, 0x8EC1, 0x8F81, 0x4F40, 0x8D01, 0x4DC0, 0x4C80, 0x8C41,
    0x4400, 0x84C1, 0x8581, 0x4540, 0x8701, 0x47C0, 0x4680, 0x8641,
    0x8201, 0x42C0, 0x4380, 0x8341, 0x4100, 0x81C1, 0x8081, 0x4040
};

static unsigned short crc16_byte(unsigned short crc, const unsigned char data)
{
	return (crc >> 8) ^ crc16_table[(crc ^ data) & 0xff];
}
 
uint16_t Crc::to16bit(uint16_t crc, uint8_t const* buffer, size_t length)
{
  	 while (length--)
	{
		crc = crc16_byte(crc, *buffer++);
	}
    return crc;
}

static unsigned   long   crc32_table[256]   =
{
    0x00000000,   0x77073096,   0xee0e612c,   0x990951ba,   0x076dc419,
    0x706af48f,   0xe963a535,   0x9e6495a3,   0x0edb8832,   0x79dcb8a4,
    0xe0d5e91e,   0x97d2d988,   0x09b64c2b,   0x7eb17cbd,   0xe7b82d07,
    0x90bf1d91,   0x1db71064,   0x6ab020f2,   0xf3b97148,   0x84be41de,
    0x1adad47d,   0x6ddde4eb,   0xf4d4b551,   0x83d385c7,   0x136c9856,
    0x646ba8c0,   0xfd62f97a,   0x8a65c9ec,   0x14015c4f,   0x63066cd9,
    0xfa0f3d63,   0x8d080df5,   0x3b6e20c8,   0x4c69105e,   0xd56041e4,
    0xa2677172,   0x3c03e4d1,   0x4b04d447,   0xd20d85fd,   0xa50ab56b,
    0x35b5a8fa,   0x42b2986c,   0xdbbbc9d6,   0xacbcf940,   0x32d86ce3,
    0x45df5c75,   0xdcd60dcf,   0xabd13d59,   0x26d930ac,   0x51de003a,
    0xc8d75180,   0xbfd06116,   0x21b4f4b5,   0x56b3c423,   0xcfba9599,
    0xb8bda50f,   0x2802b89e,   0x5f058808,   0xc60cd9b2,   0xb10be924,
    0x2f6f7c87,   0x58684c11,   0xc1611dab,   0xb6662d3d,   0x76dc4190,
    0x01db7106,   0x98d220bc,   0xefd5102a,   0x71b18589,   0x06b6b51f,
    0x9fbfe4a5,   0xe8b8d433,   0x7807c9a2,   0x0f00f934,   0x9609a88e,
    0xe10e9818,   0x7f6a0dbb,   0x086d3d2d,   0x91646c97,   0xe6635c01,
    0x6b6b51f4,   0x1c6c6162,   0x856530d8,   0xf262004e,   0x6c0695ed,
    0x1b01a57b,   0x8208f4c1,   0xf50fc457,   0x65b0d9c6,   0x12b7e950,
    0x8bbeb8ea,   0xfcb9887c,   0x62dd1ddf,   0x15da2d49,   0x8cd37cf3,
    0xfbd44c65,   0x4db26158,   0x3ab551ce,   0xa3bc0074,   0xd4bb30e2,
    0x4adfa541,   0x3dd895d7,   0xa4d1c46d,   0xd3d6f4fb,   0x4369e96a,
    0x346ed9fc,   0xad678846,   0xda60b8d0,   0x44042d73,   0x33031de5,
    0xaa0a4c5f,   0xdd0d7cc9,   0x5005713c,   0x270241aa,   0xbe0b1010,
    0xc90c2086,   0x5768b525,   0x206f85b3,   0xb966d409,   0xce61e49f,
    0x5edef90e,   0x29d9c998,   0xb0d09822,   0xc7d7a8b4,   0x59b33d17,
    0x2eb40d81,   0xb7bd5c3b,   0xc0ba6cad,   0xedb88320,   0x9abfb3b6,
    0x03b6e20c,   0x74b1d29a,   0xead54739,   0x9dd277af,   0x04db2615,
    0x73dc1683,   0xe3630b12,   0x94643b84,   0x0d6d6a3e,   0x7a6a5aa8,
    0xe40ecf0b,   0x9309ff9d,   0x0a00ae27,   0x7d079eb1,   0xf00f9344,
    0x8708a3d2,   0x1e01f268,   0x6906c2fe,   0xf762575d,   0x806567cb,
    0x196c3671,   0x6e6b06e7,   0xfed41b76,   0x89d32be0,   0x10da7a5a,
    0x67dd4acc,   0xf9b9df6f,   0x8ebeeff9,   0x17b7be43,   0x60b08ed5,
    0xd6d6a3e8,   0xa1d1937e,   0x38d8c2c4,   0x4fdff252,   0xd1bb67f1,
    0xa6bc5767,   0x3fb506dd,   0x48b2364b,   0xd80d2bda,   0xaf0a1b4c,
    0x36034af6,   0x41047a60,   0xdf60efc3,   0xa867df55,   0x316e8eef,
    0x4669be79,   0xcb61b38c,   0xbc66831a,   0x256fd2a0,   0x5268e236,
    0xcc0c7795,   0xbb0b4703,   0x220216b9,   0x5505262f,   0xc5ba3bbe,
    0xb2bd0b28,   0x2bb45a92,   0x5cb36a04,   0xc2d7ffa7,   0xb5d0cf31,
    0x2cd99e8b,   0x5bdeae1d,   0x9b64c2b0,   0xec63f226,   0x756aa39c,
    0x026d930a,   0x9c0906a9,   0xeb0e363f,   0x72076785,   0x05005713,
    0x95bf4a82,   0xe2b87a14,   0x7bb12bae,   0x0cb61b38,   0x92d28e9b,
    0xe5d5be0d,   0x7cdcefb7,   0x0bdbdf21,   0x86d3d2d4,   0xf1d4e242,
    0x68ddb3f8,   0x1fda836e,   0x81be16cd,   0xf6b9265b,   0x6fb077e1,
    0x18b74777,   0x88085ae6,   0xff0f6a70,   0x66063bca,   0x11010b5c,
    0x8f659eff,   0xf862ae69,   0x616bffd3,   0x166ccf45,   0xa00ae278,
    0xd70dd2ee,   0x4e048354,   0x3903b3c2,   0xa7672661,   0xd06016f7,
    0x4969474d,   0x3e6e77db,   0xaed16a4a,   0xd9d65adc,   0x40df0b66,
    0x37d83bf0,   0xa9bcae53,   0xdebb9ec5,   0x47b2cf7f,   0x30b5ffe9,
    0xbdbdf21c,   0xcabac28a,   0x53b39330,   0x24b4a3a6,   0xbad03605,
    0xcdd70693,   0x54de5729,   0x23d967bf,   0xb3667a2e,   0xc4614ab8,
    0x5d681b02,   0x2a6f2b94,   0xb40bbe37,   0xc30c8ea1,   0x5a05df1b,
    0x2d02ef8d
};

uint32_t Crc::to32bit (uint8_t const* buffer, size_t length)
{
	register unsigned long crc;
	unsigned long i;

	crc = 0xFFFFFFFF;
	for (i = 0; i < length; i++)
	{
		crc = ((crc >> 8) & 0x00FFFFFF) ^ crc32_table[(crc ^ *buffer++) & 0xFF];
	}
	return (crc ^ 0xFFFFFFFF);
}

}//namespace Base
}//namespace Public

